Table 4.

ICD-9 chapters for presenting diagnoses at encounter for first opioid prescription (baseline)

ICD-9 Chapter	N
Injury And Poisoning	34,416
Supplementary Classification Of External Causes Of Injury And Poisoning	18,142
Supplementary Classification Of Factors Influencing Health Status And Contact With Health Services	12,152
Symptoms, Signs, And Ill-Defined Conditions	10,998
Diseases Of The Musculoskeletal System And Connective Tissue	10,224
Diseases Of The Respiratory System	8333
Diseases Of The Nervous System And Sense Organs	8205
Diseases Of The Genitourinary System	4690
Diseases Of The Digestive System	4320
Complications Of Pregnancy, Childbirth, And The Puerperium	4012
Congenital Anomalies	3662
Diseases Of The Skin And Subcutaneous Tissue	1966
Mental Disorders	1899
Neoplasms	1869
Diseases Of The Circulatory System	1713
Diseases Of The Blood And Blood-Forming Organs	1360
Endocrine, Nutritional And Metabolic Diseases, And Immunity Disorders	1252
Infectious And Parasitic Diseases	484
Certain Conditions Originating In The Perinatal Period	88